Hi everyone, first post on here but I've been reading since I bought the bike in the spring. I'm almost ready to place my order for a 331 big bore kit but I want to make sure I'm not missing anything. So far this is what I'm getting:

Either Bill Blue or Kustom Kraft 331cc big bore kit (not sure which one to get, Bill Blue is much cheaper).
FMF Q4 + 1-1/8 Quiet Core insert (I want to keep the noise to a minimum)
FMF Powerbomb
EJK Fuel Controller
KDX200 Snorkel

Questions:
1. Is there an advantage with the Kustom Kraft kit? I know it comes with a new cylinder but there's a pretty significant price difference. I'm in east coast New-Brunswick Canada, so that means US-CAN exchange and duty fees on top of the shipping charges.
2. Is anyone keeping their stock cylinder as a back-up in case the upgrade doesn't work or fails down the line?
3. The big bore version of the EJK is for s 300cc, does this cause a problem with the 331cc? I'm guessing it will require different settings.
4. I would rather go with the 351cc kit but from what I understand there are fuel issues with the 351 and EFI.
5. How restrictive is the stock air filter? Is there any point in replacing it? I'm reading that the K&N is less restrictive but allows some dust to pass through.
6. Is there an easy way to mount a heat shield to the Powerbomb?
7. Does anything need to be done with the throttle body? I read something about removing a secondary throttle plate but I'm not finding much information about how to do it.
8. Is there anything else I need?

I will probably be getting cams later on but I don't want to have no bike while my cams are being sent for upgrading. That will likely be a winter project.

I think that's it for now but I'm sure I'll have more questions later on.

Thanks
dp19

 

 

Personally i would send the ecu off to get reflashed or tuned by a local company. I just hit my 2nd oil change n the 351 kit, so 2000 mile and i get a touch less mpg depending on how i drive

 

I use my original heat shield. Tried one from FMF and it was bogus.

 

Could you please elaborate on how you did this? I was not aware that the original ecu could be reflashed. Also I don't think there's anyone locally that would do that.

 

 

 

How did you mount it on there? Would you mind posting a photo?

Also I really appreciate everyone's feedback so far!

 

KLXster has a performance exhaust choices and considerations sticky that has a youtube of how to install stock heat shield on power bomb.

https://www.kawasakiforums.com/forum...rations-44444/

 

Thanks everyone for your input! I have ordered the necessary parts for the big bore kit. It's gonna take at least a few weeks to get it all since I'm on the East Coast of New-Brunswick (Canada) and the postal delays from the US to Canada are very real.

One more thing though, do I have to do something with the subthrottle butterfly? Is it necessary to remove it?

Thanks
dp19